package com.example.springboot.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;

import java.util.concurrent.ThreadPoolExecutor;

/**
 * 开启并行任务方式一
 * <p>
 */
@Configuration
public class InitConfig {


    /**
     * 定义一个调度任务池。
     * <p> 便于多线程执行调度任务
     */
    @Bean
    public TaskScheduler taskScheduler() {
        ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();
        taskScheduler.setThreadNamePrefix("wcr-task-");
        //线程池大小默认为cpu核数
        taskScheduler.setPoolSize(Runtime.getRuntime().availableProcessors());
        return taskScheduler;
    }

    // 核心线程池大小
    private final int corePoolSize = 50;

    // 最大可创建的线程数
    private final int maxPoolSize = 200;

    // 队列最大长度
    private final int queueCapacity = 1000;

    // 线程池维护线程所允许的空闲时间
    private final int keepAliveSeconds = 300;


    /**
     * 定义一个业务线程池
     */
    @Bean(name = "threadPoolTaskExecutor")
    public ThreadPoolTaskExecutor threadPoolTaskExecutor()
    {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setMaxPoolSize(maxPoolSize);
        executor.setCorePoolSize(corePoolSize);
        executor.setQueueCapacity(queueCapacity);
        executor.setKeepAliveSeconds(keepAliveSeconds);
        // 线程池对拒绝任务(无线程可用)的处理策略
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        return executor;
    }

}
